set page_config in initalize_handlers

notebook/app.py

@@ -62,9 +62,6 @@ def get_page_config(self):
  api_token = os.getenv("JUPYTERHUB_API_TOKEN", "")
  page_config["token"] = api_token
 
- nbclassic_enabled = self.server_extension_is_enabled("nbclassic")
- page_config["nbclassic_enabled"] = nbclassic_enabled
-
  server_root = self.settings.get("server_root_dir", "")
  server_root = server_root.replace(os.sep, "/")
  server_root = os.path.normpath(os.path.expanduser(server_root))
@@ -116,16 +113,6 @@ def get_page_config(self):
  )
  return page_config
 
- def server_extension_is_enabled(self, extension):
- """Check if server extension is enabled."""
- try:
- extension_enabled = (
- self.extensionapp.serverapp.extension_manager.extensions[extension].enabled is True
- )
- except (AttributeError, KeyError, TypeError):
- extension_enabled = False
- return extension_enabled
-
 
 class RedirectHandler(NotebookBaseHandler):
  """A redirect handler."""
@@ -274,8 +261,22 @@ def _default_user_settings_dir(self):
  def _default_workspaces_dir(self):
  return get_workspaces_dir()
 
+ def server_extension_is_enabled(self, extension):
+ """Check if server extension is enabled."""
+ try:
+ extension_enabled = (
+ self.serverapp.extension_manager.extensions[extension].enabled is True
+ )
+ except (AttributeError, KeyError, TypeError):
+ extension_enabled = False
+ return extension_enabled
+
  def initialize_handlers(self):
  """Initialize handlers."""
+ page_config = self.serverapp.web_app.settings.setdefault("page_config_data", {})
+ nbclassic_enabled = self.server_extension_is_enabled("nbclassic")
+ page_config["nbclassic_enabled"] = nbclassic_enabled
+
  self.handlers.append(
  (
  rf"/{self.file_url_prefix}/((?!.*\.ipynb($|\?)).*)",